[PATCH] app/testpmd: fix secondary process cannot dump packet

[Dmitry Kozlyuk]

On Mon, Jul 4, 2022 at 5:37 AM lihuisong (C) <lihuisong at huawei.com> wrote:

> [...]
> 在 2022/7/1 19:36, Zhang, Peng1X 写道:
> [...]
> > The reason why not use 'dev->data->rx_queue_state' is whether queue
> state is start or stop in primary
> > process depend on rx_conf->rx_deferred_start after start testpmd. And
> after having started testpmd,
> > queue state can be controlled by command for example 'port x rxq x
> start'.
> > Should we align with the same behavior of queues state for primary and
> secondary process after start testpmd?
> If primary process stops a queue, but secondary doesn't know.
> we have to simplify this queue state problem like you momentioned
> if we don't have a good idea.
>

AFAIU, dev->data->rx_queue_state should be aligned with
rx_conf->rx_deferred_start.
The reason why testpmd manages the queue state itself in the offending patch
is that not all PMDs implement `rte_eth_rx/tx_queue_info_get()`
and ethdev won't return `dev->data->rx_queue_state` in this case.
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